. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 362 ECONOMIC ZOOLOGY AND ENTOMOLOGY the only way in which malaria is transmitted, and that the low-lying lands or swamps have nothing whatever to do with malaria except in so far as they furnish a breeding place for mosquitoes. Much less, then, can the mists or bad air—mal aria in the Italian—produce malaria. Without mosquitoes there is no malaria. TEXAS FEVER OF CATTLE To the genus Babcsia (formerly known as Piroplasma) be- long several species of blood parasites that are of great eco- nomic importance. In the ve
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 362 ECONOMIC ZOOLOGY AND ENTOMOLOGY the only way in which malaria is transmitted, and that the low-lying lands or swamps have nothing whatever to do with malaria except in so far as they furnish a breeding place for mosquitoes. Much less, then, can the mists or bad air—mal aria in the Italian—produce malaria. Without mosquitoes there is no malaria. TEXAS FEVER OF CATTLE To the genus Babcsia (formerly known as Piroplasma) be- long several species of blood parasites that are of great eco- nomic importance. In the vertebrate host they live in the. FIG. 154.—Texas fever tick, Margaropus annulatus, young adult not fully gorged. (About four times natural size.) red blood corpuscles, and they are transmitted from one animal to another by means of ticks. The most important of the diseases caused by the members of this genus is a disease of cattle known in the United States as Texas fever, or tick fever, or splenic fever. It occurs in nearly all tropical and subtropical and in many temperate regions, and outside of the United States is more commonly known as "red ; In the United States it causes an annual loss estimated at $100,-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kellogg, Vernon L. (Vernon Lyman), 1867-1937; Doane, Rennie Wilbur, 1871-. New York, H. Holt and company
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